Semi-trailer for use in building site, has front axle moved between active position and folded position, in which wheel is positioned higher without touching ground in position coupled to towing vehicle

摘要

The semi-trailer (1) has a rear axle (3), a front axle (4) rotating around a vertical axis, and a rotation actuator rotating around an axis of the front axle. The front axle comprises a wheel and a wheel actuator. A motor is attached with a wheel. The front axle is moved between an active position, in which the wheel is adapted to support on the ground by operation of the actuator and to guide and move the semi-trailer, and a folded position, in which the wheel is positioned higher without touching the ground in a position coupled to a towing vehicle.